Path.php

1. 8.x drupal/core/lib/Drupal/Core/Path/Path.php
2. 8.x drupal/core/modules/node/lib/Drupal/node/Plugin/views/field/Path.php

<?php

/**
 * @file
 * Definition of Drupal\node\Plugin\views\field\Path.
 */
namespace Drupal\node\Plugin\views\field;

use Drupal\views\Plugin\views\field\FieldPluginBase;
use Drupal\views\Plugin\views\display\DisplayPluginBase;
use Drupal\views\ViewExecutable;
use Drupal\Component\Annotation\PluginID;

/**
 * Field handler to present the path to the node.
 *
 * @ingroup views_field_handlers
 *
 * @PluginID("node_path")
 */
class Path extends FieldPluginBase {

  /**
   * Overrides \Drupal\views\Plugin\views\field\FieldPluginBase::init().
   */
  public function init(ViewExecutable $view, DisplayPluginBase $display, array &$options = NULL) {
    parent::init($view, $display, $options);
    $this->additional_fields['nid'] = 'nid';
  }
  protected function defineOptions() {
    $options = parent::defineOptions();
    $options['absolute'] = array(
      'default' => FALSE,
      'bool' => TRUE,
    );
    return $options;
  }
  public function buildOptionsForm(&$form, &$form_state) {
    parent::buildOptionsForm($form, $form_state);
    $form['absolute'] = array(
      '#type' => 'checkbox',
      '#title' => t('Use absolute link (begins with "http://")'),
      '#default_value' => $this->options['absolute'],
      '#description' => t('Enable this option to output an absolute link. Required if you want to use the path as a link destination (as in "output this field as a link" above).'),
      '#fieldset' => 'alter',
    );
  }
  public function query() {
    $this
      ->ensureMyTable();
    $this
      ->addAdditionalFields();
  }
  function render($values) {
    $nid = $this
      ->getValue($values, 'nid');
    return url("node/{$nid}", array(
      'absolute' => $this->options['absolute'],
    ));
  }

}